Signal and control system for elevators



May 26, 1936. w. F.,EAMES SIGNAL AND CONTROL SYSTEM FOR ELEVATORS FiledFeb. 7, 1934 8 Sheets-Sheet l INVENTOR W/W/a/n Ffames.

ATT NEY WITNESSES:

May 26, 1936.

w. F. EAMES SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Filed Feb. 7, 1954 8Sheets-Sheet 2 Down fi/recf/on Up Dirac/fol? m mto tkm tuw Kant wbtm66?- baza/n/a 60/4 INVENTOR Wf/ /fam F fumes.

A RNEY May 26, 1936. w. F. EAMES SIGNAL AND CONTROL SYSTEM FOR ELEVATORSFiled Feb. '7, 1934 8 Sheets-Sheet 4 May 26, 1936. w F, EAME 2,042,214

S IGNAL AND CONTROL SYSTEM FOR ELEVATORS aaur/ WITNESSES: 1-3 +4INVENTOR Z i W/'///'am 'Ffames.

AT NEY v W. F. EAM ES May 26, 1936.

SIGNAL AND CONTROL SYSTEM'FOR ELEVATORS Filed Feb. '7, 1954 8Sheets-Sheet 6 May 26, 1936.

W. F. EAM ES SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Filed Feb. 7, i9348 Sheets-Sheet 7 May 26, 1936. w. F. EAMES SIGNAL AND CONTROL SYSTEM FORELEVATORS 8 Sheets-Sheet 8 Filed Feb. '7, 1934 NEY INVENTOR W////am FEames.

wdswm a W 4 i mw Q u} U Patented May 26, 1936 UNITED STATES PATENTOFFICE SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Application February 7,1934, Serial No. 710,104

34 Claims.

My invention relates to signal and control systems for elevators andmore particularly to systems in which the intending passengers mayoperate push buttons at the floor landings to effect the giving of stopsignals in approaching cars and the car attendants may operate controldevices in the cars to cause the cars to stop when they arrive at thefloors indicated by the stop signals.

One object of my invention is to provide a signal and control systemwhich will promote the answering of calls and the loading and unloadingof passengers in a prompt and efiicient manner.

Another object is to relieve the car attendants of the necessity ofwaiting until their cars are within predetermined distances of thefloors for which stop signals have been receivedybefore setting thestopping means to cause the cars to stop at the floors indicated by thestop signals upon their arrival thereat.

Another object is to provide for promptly notitying a waiting passengerat a floor which car will stop for him when the attendant on the nearestapproaching car conditions its control system to make the stop when itarrives at the floor indicated by the stop signal.

A further object of my invention is to provide a signal and controlsystem in which the conditioning of a car, upon the receipt of a stopsignal from a floor, to cause that car to stop at that floor upon itsarrival thereat, will prevent any other car from receiving the same stopsignal.

A still further object is to provide means, in a system havingannunciators in the car to indicate to the car attendant the floors atwhich steps should be made for waiting passengers, so that when aprospective passenger presses a stop button at a floor, only theannunciator in the nearest car approaching in the desired direction willbe operated to indicate that a stop is to be made at that floor.

It is also an object of my invention to provide a signal and controlsystem which requires only one set of push buttons in the car which maybe selectively operated to cause the car to stop at any desired floorupon its arrival thereat, either when a passenger desires to get off atthat floor or when a stop signal is received from a passenger at thatfloor.

These and other objects which will appear hereinafter may be attained bymeans of the apparatus and system hereinafter described and illus tratedin the accompanying drawings, wherein:

Figure 1 is a diagrammatic representation of an elevator installationembodying my improved signal and control system;

Fig. 2 is an enlarged representation of the contact segments andcooperating contact brushes on the floor selector of one of the carsshown in Fig. l;

Figs. 3, 4 and 5, collectively, constitute a diagrammaticrepresentation, in what is known as the straight-line style, of thesignal and control system used in operating the elevator cars shown inFig. 1;

Figs. 3A, 4A and 5A, collectively, constitute an explanatoryillustration of the relays embodied in Figs. 3, 4 and 5; and

Fig. 6 represents a key to the conventional forms for the contactmembers, relay coils, etc., shown in Figs. 3 to 5A inclusive.

The relays illustrated in Figs. 3A, 4A and 5A are shown with their coilsand contact members disposed in such positions as to be in horizontalalignment with the positions in the straight line circuits of Figs. 3, 4and 5, so that the identification of any relay, the number and kind ofits contact members and the position of its coil and contact members inthe straight line circuits, may be readily determined by an examinationof the drawings.

For convenience in reading the drawings, Fig. 4 should be placed underFig. 3, Fig. 5 under Fig. 4, Fig. 3A beside Fig. 3, Fig. 4A beside Fig.4 and under Fig. 3A,'and Fig. 5A beside Fig. 5 and under Fig. 4A.

Referring more particularly to the drawings, I have illustrated anelevator installation embodying two cars A and B for serving five floorsor landings. The cars are indicated as suitably suspended by hoistingcables H and I2, which pass over hoisting drums l3 and EH to suitablecounterweights l5 and I6, respectively.

Although I have, for the sake of simplicity, illustrated only two carsand a signal and control system therefor, as applied to only livefloors, it is to be understood that the system is equally applicable toany suitable number of cars for serving any suitable number of floors.

For convenience, the main relays in the system are designated asfollows:

A=car A.

B=car B.

C=stop push buttons in car A.

CC=holding coils for car buttons in car A.

D=down direction switch for car A.

Ezinductor relay for decelerating car A.

F=inductor relay for stopping car A.

G=relay for maintaining inductor relays energized for car A.

=response signalling relays for car A.

o uozg R=stop signal registering relays, common to both cars.

S=stopping relay for energizing inductor relays to stop car A.

T=stop signal lamps in car A.

U=up direction switch for car A.

V=high speed relay for car A.

W=up direction preference relay for car A.

X=down direction preference relay for car A.

Y=zone feeding relays for car A.

Z=zone relays, common to both cars.

The relays for car B are given the same reference characters as thosegiven for car A plus the letter B. The prefix letters U and D indicateup or down direction. The prefix numerals indicate the floors; thesuflix numerals indicate the contact members of the relays. Forinstance, the reference character BdUY designates an up zone feedingrelay for the fourth floor for car B, and BAUYI designates one pair ofthe contact members of that relay.

Referring to the control system for car A as shown in Figs. 2 and 3, thehoisting drum I3 is directly coupled to an armature ll of a hoistingmotor l8, the field winding 53 of which is connected, for constantvoltage energization, to a suitable source of electric energy designatedby the supply conductors L+l and LI. It should be noted that the supplyconductors extend through the system shown in Figs. 3, 4 and 5, theadditional sections being marked L+3, L3, L+4, L4, L+5, L-5, L+6 andL-6.

A variable voltage system of control, such as is old and well known inthe art, may be provided for operating the hoisting motor I8. In suchsystems, as shown in Fig. 3, the armature I1 is connect-ed in a loopcircuit with the armature 2| of a generator 22. The generator isprovided with a separately excited field winding 23 and a cumulativeseries field winding 24. A resistor R24 is disposed in the circuit ofthe separately excited field winding 23 for controlling the operation ofthe generator. The armature 2| of the generator may be driven by asuitable driving motor 25 which may be connected to a suitable source ofsupply as represented by the conductors and switch 2%.

A brake 5 is provided for operation by a brake magnet 6 to apply abraking eifect to the hoisting drum 13 when the car is stopped, thebrake magnet 6 being energized to release the brake 5 while the car isrunning and being deenergized to apply the brake 5 when the supply ofpower to the car is cut off.

The direction and speed of the hoisting motor I8 may be suitablycontrolled by controlling the direction and the value of excitationcurrent in the separately excited field winding 23. The direction of theexcitation current may be suitably controlled by an up direction switchU and a down direction switch D, and the value of the current may becontrolled by means of a speed relay V, which controls the resistor R24in the generator field circuit.

The closing of the up direction or the down direction switches U and D,as well as the high speed control relay V, may be effected by means ofan up push button UP and a down push button DP that are mounted in thecar in the position to be actuated by the car attendant.

Any suitable means may be employed for automatically stopping the car Alevel with the fioors it serves. As one example of such means I haveillustrated an automatic inductor relay landing system similar to thatdisclosed in Patent No. 1,884,446, issued October 25, 1932, to K. M.White and. G. K. Hearn, assignors to Westinghouse Electric ElevatorCompany.

The inductor landing system for car A includes a decelerating inductorrelay E and a stopping inductor relay F (see Fig. 1) for causing the carto be automatically decelerated from its high speed and brought to astop at an exact level with the fioor. The decelerating inductor relay Eis mounted on the car A in position to cooperate with an inductor plateUE for the up direction and an inductor plate DE for the down directionmounted in the hatchway. The stopping inductor relay F is mounted on thecar A in position to cooperate with an inductor plate UF for the updirection and an inductor plate DF for the down direction. Forsimplicity, only one set of inductor plates for one floor has beenshown, but it will be understood that a set similar to that shown is tobe provided for each floor served by the car intermediate the upperterminal landing and the lower terminal landing. At the terminallandings, a set of inductor plates corresponding to the inductor platesUE and UF may be provided for the upper terminal and a set correspondingto inductor plates DE and DF may be provided for the lower terminal.

As shown, each inductor relay is provided with two sets of contactmembers, For an up stop, the contact members'El of relay E cooperatewith the inductor plate UE in decelerating the car, and the contactmembers Fl of relay F cooperate with the inductor plate UF in stoppingthe car after it has decelerated. For the down direction the contactmembers E2 of relay E cooperate with the inductor plate DE to deceleratethe car A and the contact members F2 cooperate with the inductor plateDF in stoppingthe car.

The inductor relays are of the self-holding type, that is, when they areenergized but have not yet come opposite an inductor plate, the contactmembers remain closed, but when the relay comes opposite an inductorplate, the contact members adjacent that plate move to an open positionand are held in such open position until the inductor relay isdeenergized. The means for holding the contact members in the openposition on inductor relay E, for instance, are the extended portions 28and 29 (Fig. 1).

For instance, it will be seen that when the inductor relay E passes thedown inductor plate DE in an energized condition, the contact members E2will be opened, and the arm 29a will be moved upwardly to such aposition that they would be attracted and held by the magnetizedprojection 29. Therefore, the opened contact members remain open and donot reclose after passing the inductor plate to complicate the operationof the control system. However, I do not desire to be limited toinductor relays of this particular type because inductor relays withtemporary opening contact members which are well known in the art may beemployed just as readily if the motor control system is adjusted tocooperate with them.

The contact members on the inductor relays just described are soconnected with the car control circuits that, when the inductor relaysare energized to decelerate and stop the car at the floor represented bythe inductor plates in the down direction, the contact members E2 passthe inductor plate DE and are thereby opened to decelerate the car, bydeenergizing the speed relay V, and as the contact members F2 comeopposite the inductor plate DF, they open to stop the car level with thefloor by opening the down direction switch and applying the brake 5. Thecontact members El of relay E and the contact members Fl of the relay Fare opened by the inductor plates UE and UF, respectively, when a stopis made in the up direction.

When the inductor relays are energized to stop the car, it is desired tomaintain them in that condition until they are operated by passing theinductor plates to bring the car to rest. A slowdown holding relay G isprovided for this purpose, (see Fig. 3).

When the inductor relays are energized to effect a stop, the relay Gholds them energized until they are restored, even though their contactmembers are operated to open as the relays pass the inductor plates.Therefore, an inductor restoring relay H is provided for deenergizingthe inductor relays of car A after a stop has been made and also for sointerlocking them that they may be energized only when the car ismoving.

The exact position of the inductor plates in the hatchway and of theinductor relays on the cars cannot be here given because the position ofthese devices varies in each installation by reason of differences inhoisting motors, weight of cars, height of ceilings, etc. However, inthe many commercial installations of inductor stopping systems alreadymade, it has been found that the mechanics have no difficulty inascertaining the precise positions in which the plates and relays shouldbe placed when the cars are first tried out in operation.

In the elevator system illustrated in the drawings, the energization ofthe inductor relays on car A for decelerating and stopping the car at afloor is effected by a stopping relay S. This relay is energized, as thecar nears the floor at which a stop is to be made and, in turn,energizes the inductor relays on that car so that they will, as theypass the inductor plates for that direction for that floor, cause thecar to decelerate and stop at the floor.

The stopping relay S is controlled by a plurality of stop push-buttons(one for each floor) in the car A; so that the pressing of a car buttonby a car attendant at any time will at once register a stop call whichwill later cause the stopping relay S to be energized to stop the car atthe floor corresponding to that push button. By registering a stop call,I mean the act of initiating and maintaining a circuit which will becompleted later as the car nears the floor corresponding to the operatedbutton and thereby then energize the stopping relay S to energize theinductor relays to stop the car at that floor. With this system, the carattendant may stop the car at any floor by pressing the correspondingpush button in the car, either to let off passengers or to take onpassengers.

The stop push buttons in car A are designated as IC, 20, 30, 4C and 5Cfor the first, second, third, fourth and fifth floors, respectively.

Associated with the respective car push buttons for car A are holding orregistering coils ICC, 200, 40.0 and 500. These coils operate to holdthe car push-buttons in a depressed position after they are pressed bythe car attendant to cause the car to stop at selected floors. The coilsare automatically deenergized when the car reaches the terminal floorsto release the buttons for the next direction of operation.

Inasmuch as stop push buttons have been disposed in the cars to enablethe car attendants to stop the cars at the various floors, it isdesirable to have some means whereby waiting passengers at the variousfloors may give stop signals to the attendants in the cars. Therefore,each car is provided with an annunciator to be operated by push buttonswitches disposed at the floor landings in position to be operated bythe waiting passengers at the landings. The annunciator in car A isdesignated by the numeral 21; that in car B by the numeral B21.

The floor push-button switches are designated as IUJ, ZUJ, 3UJ, and 4UJfor the up direction at the first, second, third and fourth floors, andas 5DJ, 4DJ, 3DJ, and ZDJ for the down direction at the fifth, fourth,third and second floors.

The fioor button switches are common to both cars; that is, there isonly one button for each direction at each floor, regardless of thenumber of cars, and a waiting passenger needs to press only one buttonfor the direction in which he desires to go in order to set up a stopsignal in the nearest approaching car for that direction.

The annunciators in the cars may be of any suitable kind. The one shownin car A is provided with a plurality of small signal devices such aselectric lamps for indicating the floors at which stops should be madeto take on waiting passengers, there being one lamp for each directionfor each of the intermediate floors and an up lamp for the lowerterminal and a down lamp for the upper terminal. The signal lamps in theannunciator 2'! in car A are designated as IUT, ZUT, 3UT and 4UT,corresponding to the first, second, third and fourth floors in the updirection, and as EDT, 4DT, 3DT and 2DT, corresponding to the fifth,fourth, third and second floors in the down direction. The lamps foreach floor are placed behind a single jewel. For instance, the lamps 4UTand 4DT for the fourth floor are placed behind the jewel 21a for thefourth floor, so that the lighting of either lamp will illuminate thejewel. When the jewel is illuminated on an up trip, the operator knowsthat he is being signalled to make an up stop at the fourth floor. Onthe other hand, when the jewel is illuminated on a down trip, theoperator is being signalled for a down stop.

Associated with the floor push buttons are registering relays IUR, ZUR,3UR and flUR for the up direction and 5BR, 4DR, 3DR and ZDR for the downdirection. These relays operate to maintain a floor button circuit inits completed condition after its button is pressed until the stopsignal is accepted by a car; that is, until a car attendant acknowledgesthe stop signal by pressing the stop button in his car for thecorresponding floor to cause that car to stop when it arrives at thatfioor.

With this system, the temporary operation of a floor button willregister or, in other words, initiate and mainta n t circuit which willlig the corresponding stop signal lamp in the annunciator of the nearestapproaching car for that floor and in the direction corresponding to theoperated button and it will not be necessary to continue pressing thebutton after it is once operated to maintain the stop signal in the car.Also by reason of this system the signal lamp in the annunciator of thenearest approaching car in the desired direction will light as soon asthe button is pressed.

When a waiting passenger at a floor presses a push button at that floor,thus lighting the stop signal lamp in the next car for that floor, andthe attendant in that car, upon observing the lighted stop signal,presses the corresponding car button to cause the car to stop when itarrives at the floor where the passenger is waiting, it is desirable tohave some means for informing the waiting passenger that the carattendant has recognized his stop signal and will make a stp for him. Itis also desirable to indicate which car will make the stop so that thepassenger may at once walk to the hatchway, door for that car and beprepared to enter the car as soon as it arrives and the doors open. Toaccomplish this purpose, I have provided a plurality of signal orindicating devices, preferably electric lamps, which are mounted outsideof the elevator shafts at the floor landings. These lamps are usuallyknown as floor lanterns.

Each of the top and bottom floors is provided with a single floorlantern for each car, the lanterns at the lower floor terminal toindicate the up direction and the lanterns at the upper fioor orterminal to indicate the down direction. Each of the intermediate floorsis provided with a pair of lanterns for each car, one lantern .toindicate that the corresponding car is approaching for the downdirection and will make a down stop at the fioor, and the other lanternfor indicating that the car is approaching the floor for an up directionand will make an up stop. The responsive signal is given immediatelyupon the pressing of the car button by the car attendant, even thoughthe car may be many floors away from the floor where the stop signaloriginated.

The floor lanterns for car A (Fig. 3) are designated as IUL, ZUL, 3ULand 4UL for the up direction at the first, second, third and fourthfloors, and 5DL, lDL, 3DL and 2DL for the fifth fourth, third and secondfloors in the down direction.

In order to provide for the immediate illumination of the floor lanternsin response to the operation of the car button by the car attendant, sothat the waiting passenger may step to the door indicated and be readyto board the car when it arrives, I have provided a plurality ofresponse signalling relays which are individual to the cars and whichare operated by the stop push buttons in the cars. The responsesignalling relays for car A are designated as M, N, O, P and Q.

It may be noted here that the registering relays IUR, 2UR, etc., alsohave contact members in the circuits of the response signalling relaysto prevent their operation and consequently the operation of a signallight at a fioor when a car button is operated to stop a car if the pushbutton at that floor has not been operated by a Waiting passenger. Ifthis function were not pro vided, a plurality of cars might have theircar buttons operated to stop them at a floor where a waiting passengerhad pressed a button and the floor lanterns for all cars would belighted,

thus confusing the Waiting passenger as to which car would be first toarrive and stop for him.

Each of the response signalling relays is provided with a cancellationcoil which may be energized to restore the response signalling relays totheir normal condition after they have been operated. The cancellationcoils for the response signalling relays for car A are designated as MC,NC, OC, PC and QC.

When a waiting passenger at a fioor presses the push button to give astop signal to an approaching car, it is desirable to have the stopsignal given on the annunciator in the nearest approaching car for thedesired direction but not affect the annunciators in the other cars. Itis also desirable to so operate the response signalling relays that thecar attendant may operate the stop buttons in the car, immediately uponreceipt of a stop signal, to cause the car to make the desired stop,without waiting until the car gets within a predetermined distance ofthe floor at which the stop is to be made. That is, the car attendantmay set the car for a stop and the system will automatically take careof making the stop when the car arrives at the fioor at which the stopis to be made.

In order to accomplish these purposes, I have provided a plurality ofzone relays and zone feeding relays. The zone relays (Fig. 4) are commonto both cars, are operated by the zone feeding relays and are designatedas 2UZ, 3UZ and 4UZ for the up direction and ADZ, 3DZ and ZDZ for thedown direction. The zone feeding relays are individual to each car andare operated in accordance with the position of the car, those for car Abeing designated as IUY, ZUY, 3UY and AUY for the up direction for thefirst, second, third and fourth floors and as SDY, lDY, SDY and ZDY forthe down direction at the fifth, fourth, third and second floors.

The zone relays divide the up signal circuits and also the down signalcircuits of the cars into a plurality of sections. For instance, thesignal circuits represented by the conductors 43 and 44 leading to thestop signal lamps IU'I, etc., 45 in car A (see Fig. 3) are divided intosections by the contact members ZUZI, 2DZl, etc., of the zone relays.

The zone feeding relays control the zone relays and other contactmembers in such manner as to so connect the circuit sections that theshaft travel of all the cars is divided into as many effective up signalcircuit zones as there are cars on the up trip and into as manyeffective down signal circuit zones as there are cars on the down trip.

The zone feeding relays, being operated in accordance with the positionsof the cars, also assign the circuit zones to the several cars; that is,they assign one zone to each car. The efiective circuit zone assigned toany one car is that portion of the circuit in advance of that car up tothe next car ahead of it. The effective zone for each car is elastic andkeeps moving along with that car and the next car in front thereof, thelength of the zone for any car being determined by the position of thatcar and the position of the next car ahead of it.

The zone feeding relays not only assign the zones to the cars but theyalso feed such zones after they are assigned; that is, they connect theassigned zones to a supply circuit in such manner as to prepare therelays, etc., in the zone circuit for energization.

After the attendant in the car acknowledges Cir a stop signal given by awaiting passenger at a floor; that is, after he has pressed thecorresponding car button to stop his car in response to the stop signalwhen the car arrives at the floor, it is desirable to have some meansfor preventing any of the other cars in the system from receiving thesame stop signal. I have provided such a means in the form of aplurality of preventing relays designated as UK, ZUK, 3UK and GUK forthe up direction for the first, second, third and fourth floors, andSDK, 4DK, 3DK, and 2DK for the down direction for the fifth, fourth,third and second floors. The preventing relays are common to both carsand are operated by the response signalling relays that are indi--vidual to each car.

In order that certain circuits may be conditioned for operation onlywhen car A is moving upwardly and other circuits may be conditioned foroperation only when car A is moving downwardly, I have provided an updirection preference relay W and a down direction preference relay X,which relays operate in accordance with the direction in which the caris operated.

In order that the various circuits for the push buttons, floor lanterns,relays, etc., may be connected in accordance with the position of thecars with respect to the fioors past which they operate, the car A isprovided with a floor selector SE and the car B with a floor selectorBSE. The floor selectors may be of any suitable type such as are usuallyemployed in elevator systems, and may be located at any suitable pointsuch for example as in the penthouse or in the elevator shafts.

The floor selector SE for car A is provided with a set of up contactsegments and a set of down contact segments (Fig. 2) which are arrangedaccording tothe floors and which are disposed to be engaged bycooperating brushes 30 to 31, inclusive, mounted upon and insulated froma movable arm SM.

The movable arm SM is operated in accordance with the movements of car Aby means of a screw shaft 38 that may be driven by some part of theoperating mechanism of the car. A frictional engagement between the armSM and its operating screw 38 will cause the arm tobear upon the upcontact segments when the car is traveling upwardly and upon the downcontact segments when the car is traveling downwardly. It will beunderstood that the arm will tilt from one side to the other when thedirection of operation of the car is reversed.

However, in the present system, when the car is at a terminal, it isdesirable to have the arm SM tilt to the opposite direction as soon asthe car is conditioned to travel in the opposite direction withoutwaiting until the car actually begins to move. For this purpose eachfloor selector is provided with a pair of electromagnets which tilt thefloor selector arm for the up direction when the car is at the lowerterminal upon the .cars up switch being closed, and to tilt the selectorarm to the down direction when the car is at the upper terminal upon thecars down switch being closed. The electromagnets on the floor selectorSE (Fig. 1) for car A are designated as 40 for the "up direction and 4|for the down direction.

The group of up contact segments designated as a under the brush 3!!(Fig. 2) are energized when stop calls are registered on the car stopbuttons for the purpose of energizing the stopping relay S to stop thecar on its up trip when it approaches a floor at which an up Stop is tobe made.

The group of up contact segments designated as b under the brush 3|completes the circuits for cancelling or restoring the responsesignalling relays when a stop is completed.

The group of up contact segments a under the brush 32 are energized bythe response signalling relays to cause the lighting of the floorlanterns when the car is to stop at theifloors for which car stopbuttons have been operated.

The up contact segments designated as (I under the brush 33 serve to soconnect the circuits to the zone feeding relays that these relays willbe energized in accordance with the position of the car.

The contact segments on the down side of the floor selector are engagedby the down brushes 34, 35, 36 and 31 when the car is descending andcorrespond to the contact segments just described for the up direction,those marked e being the stopping segments, 1 the cancellation segments,g the down floor lantern segments, and h the down zone relay feedingsegments.

The floor selector BSE for car B is similar to the one described for carA and inasmuch as the control system for car B is similar to that justdescribed for car A, a detailed description of the control system forcar B will be omitted.

It may be noted here that the spacing and positioning of the contactsegments on floor selectors is an old art, and that the position of thesegments cannot be selected until the height of a building, thedistances between floors, etc. for a given installation are known. Afterthese details are supplied, any mechanic acquainted with the art will beable to produce a satisfactory selector to connect the circuits of thecars in accordance with the floors past which they operate.

The invention may be understood best from an assumed operation of theapparatus illustrated in the drawings.

The switch 26 (Fig. 3) and the switch B26 (Fig. 5) are closed to startthe motor generator sets of the cars. The switches 20 (Fig. 3) areclosed to prepare-the control systems of both cars for operation.

The closing of the switches 20 connects the supply conductors L! to L6inclusive to a suitable source of energy (not shown), thereby energizingthe field winding 59 of the hoisting motor ll! of car A and the fieldwinding Bl9 of the hoisting motor BIS of car B to prepare them foroperation.

It will be assumed that car A is standing at the lower floor with itsdoor open and that car B is standing at the third floor with its dooropen on a down trip.

Inasmuch as car B is standing at the third floor on a down trip its downdirection preference relay BX is energized by a circuit extending fromthe supply conductor L+5 (Fig. 5) through the contact members BUPZ, thecoil of relay BX and the contact members BW5 to the supply conductor L5.The down electromagnet B is in parallel with the coil BX and is,therefore, also energized for tilting the arm BSM to the down side ofthe floor selector BSE, causing its down brushes to engage the downcontact segments on the floor selector. The energization of. the downdirection preference relay BX also connects various circuits for thedown operation of car B.

Inasmuch as car B is standing at the third floor on a down trip, thefloor lantern B3DL at the third floor is lighted by a circuit extendingfrom the supply conductor L+6 through the lamp B3DL, the contact segmentB3g, brush B36 and the contact members B1 12 to the supply conductor L6.The downlamp B3DL for car B will remain lighted while car B stands atthe third floor.

In this position of car B the zone feeding relay brush B31 for car B isin engagement with the down contact segment BSh, thereby energizing thezone feeding relay B3DY to close its contact members B3DYI B3DY2 andB3DY3. The closing of the contact members B3DY| energizes the zone relay3DZ to cut off the signal circuits behind P car B. Hence that zone inthe circuit for car B behind car B is an ineffective zone for car B.This is done by the opening of the contact members 3DZ4 (Fig. 5) and theopening of the contact members 3DZ2 (Fig. 3) in the circuits leading tothe responsive signalling relays M, N and O and by opening the contactmembers 3DZI in the circuit leading to the stop signal lamp 3DT in carA, and by opening the contact members 3DZ3 (Fig. 5) leading to thesignal lamp BSDT in car B.

The closing of the contact members B3DY2 of the energizing zone-feedingrelay BilDY connects the signal circuit zone ahead of car B to thesupply conductor L-G so that the operation of, a down floor button at afloor ahead of car B will light the stop signal. Hence that zone in thecircuit for car B ahead of car B is an effective zone for car B.

The closing of the contact members B3DY3 connects the signal zonecircuit of the response signalling relays BP and BQ to the supply conductor L5 so that the attendant in car B can acknowledge all stopsignals received by him and cause the lighting of the floor lanterns forcar B at the floors where stop signals for car B have originated.

Turning now to a consideration of car A standing with its door open atthe lower floor, it will be assumed that the car attendant presses theup direction push button UP to prepare the car for an up trip. However,the car will not start upwardly because the door is open and the opendoor contact members 50 prevent the control circuit from operating themotor to move' the car upwardly. It is to be understood that any one ofthe old and well known switch systems may be employed for starting thecar and that the present push button system is illustrated merely forthe sake of simplicity.

The closing of the contact members UPI of the up direction push buttonUP prepares a circuit for energizing the up direction relay U, whichcircuit will be completed when the doors are closed.

The operation of the up push button UP (Fig. 3) opens its contactmembers U1 2 thereby deenergizing the down direction preference relay X,which, in turn, closes its contact members Xi, thereby completing acircuit for energizing the up direction preference relay W to preparethe circuits of car A for the up trip. The circuit for relay W extendsfrom the supply conductor L-+| through the contact members DP2, the coilof relay W and the contact members XI to the supply conductor L-Inasmuch as the down direction preference relay X has been deenergizedto open its contact members X3 and the up direction preference relay Whas been energized to close its contact members W3, the holding coilsiCC, ZCC, 30C, 4C0 and ECG for the car buttons in car A have beendeenergized to release all the push buttons operated on the down tripand have been reenergized so that on the up trip as a car push button ispressed inwardly, it will be held in that position by the correspondingholding coil until the car gets to the end of its up trip.

The coil of the electromagnet 40 which is in parallel relation to thecoil of the relay W is also energized by the closing of the contactmembers XI of relay X to tilt over the floor selector arm SM, therebyprepared the floor selector of. car A for the up trip.

With the floor selector arm in the up position, the brush 32 engages thecontact segment lo and thereby completes a circuit for lighting the upfloor lantern IUL at the lower floor, which circuit extends from thesupply conductor L+2 through the up lamp IUL, the contact segment lc,brush 32 and the contact members H2 to the supply conductor L-2, thecontact members H2 being closed because the restoring relay H isdeenergized on account of the car standing at the floor. Thus it is seenthat the standing of a car at a floor will cause the lighting of thefloor lantern at that floor for that car.

The contact brush 33 also engages the contact segment Id, therebyenergizing the zone feed relay IUY by a circuit extending from thesupply conductor L+2 through the coil IUY, contact segment l d and brush33 to the supply conductor L-Z.

The closing of the contact members IUYI feeds the zone circuitrepresented by conductor 43 leading to the up lamps ZUT, etc. in theannunicator 21 in car A, that is, these contact members connect one sideof the zone circuit 43 to the supply conductor L2.

The closing of the contact members IUY2 feeds the zone circuitrepresented by the con duct'or leading to the response signalling relaysP, O, M, and N for car A; that is, it prepares these relays foroperation when the car buttons are operated.

It will be assumed now that a waiting passenger at the third floordesirous of travelling upwardly, presses the up stop signal push button3UJ at the third floor, in order to give a stop signal to the nearestapproaching car in the up direction.

It will also be assumed that a down passenger waiting at the fourthfloor presses the down button 4DJ to cause the giving of a stop signalfor the fourth floor in the nearest approaching down car.

The pressing of the down push button 4DJ at the fourth floor energizesthe stop call registering relay 4DR. by a circuit extending from thesupply conductor L+3 through the down button 4DJ,

the coil of relay 4DR and the contact members 4DK2 to the supplyconductor L3. The energization of the relay 4DR closes its contactmembers '4DR3, thereby establishing a holding circuit around the pushbutton 4DJ and causing the registering relay 4DR to remain energizeduntil the contact members 4DK2 are opened. In other "words, the downstop call at the fourth floor is new registered and will remainregistered until a car answers it. Inasmuch as no car is above the downstop at the fourth floor, no circuit can 4) through the contact-membersof button 3UJ the coil of relay 3UR. and the contact members 3UK2 to thesupply conductor L-3.

7 or in other words stored up until it is finally answered by some car,regardless of the fact that the waiting passenger does not keep hisfinger on the push button 3UJ all the time.

The energization of the relay 3UR closes its contact members SURI, 3UR2,3UR3, 3UR4 and 3UR5. The closing of the contact members 3UR3 completes aholding circuit around the push button 3UJ whereby the registering relay3UR is maintained in energized condition until the contact members 3UK2are opened.

The closing of the contact members 3UR| com pletes a circuit forlighting the stop signal lamp 3UT in car A, to indicate to the attendantin that car that he should stop at the third floor on his up trip. Thiscircuit extends from the supply conductor L+2 to lamp 3UT, contactmembers BURi and 3UKl to circuit 43 and thence through contact membersZUZI and lUYl to the supply conductor L2.

It will be assumed now that the attendant in car A notices the lightingof the up lamp 3UT, indicating an up stop at the third floor and pressestl e car button 30 in response to the stop signal. The operation of thebutton 30 lights an up signal lantern for car A at the third floor toindicate to the waiting passenger that car A will make a stop for him;it prepares to automatically stop the car when it arrives at the thirdfioor and it prevents any other car from picking up or accepting the upstop signal for the third fioor.

The pressing of the car button 30 causes it to be held in by theenergized holding coil 300. In this pressed position, the closed contactmembers of the button 3C energize the stopping contact segment 3a forthe third fioor and also complete a circuit for energizing the responsesignalling relay 0, which circuit extends from the supply conductor L+|(Fig. 3) through the contact members of push button 30, the coil ofresponse signalling relay 0, conductors 41 and 48, contact members W6and 3UR2 to the signal circuit it and the contact members 2UZ2 and IUYZto the supply conductor L-l.

The energization of the response signalling relay 0 causes it to closeits contact members 03 (adjacent the coil 0) thereby completing aselfholding circuit for itself and causing it to remain energized untilthe restoring coil 0C is energized to restore it to its normalcondition.

The closing of the contact members OI of relay 0 completes a circuit forlighting the up fioor lantern ZUL for car A at the third floor, whichcircuit extends from the supply conductor L+2 through lamp 3UL andcontact members 0 l, conductor i9 and contact members W2 to the supplyconductor L2. Thus, it is seen that the floor lantern at the third fioorfor car A is lighted as soon as the car attendant presses thecorresponding stop car button and thereby indicates to the waiting uppassenger at the third floor that his call has been acknowledged, that acar will stop for him and which door the car will stop at so that he mayat once step to that door and be ready to board the car when it arrivesand the door opens.

The energizing of the relay 0 also closes its contact members 04,thereby energizing the preventing relay SUK by a circuit extending fromthe supply conductor L+3 (Fig. 4) through the contact members 04 and W10and the coil 3UK. to the supply conductor L3. The energization of relaySUK operates to prevent any other car from receiving the up stop signalregistered for the third floor and accepted by car A. To do this, theenergized relay SUK opens its contact members 3UKE (Fig. 5) in thecircuit leading to the up signal lamp BiiUT in the annunciator B21 ofcar B. Thus it will be seen that even though car 3 should pass car A onthe way to the third floor, the up stop signal lamp for the third floorcannot be lighted in car B.

The energization of relay 3UK also opens its contact members EUK! (Fig.3) in the circuit to the up stop signal lamp 3UT in car A, therebyextinguishing that lamp.

The energization of the relay 3UK also opens its contact members 3UK2,thereby deenergizing the registering relay EUR and restoring it to itsnormal condition. However, relay 3UR cannot be reenergized until thecall is answered, because the contact members 3UK2-will remain openuntil the call is answered.

It will be assumed now that the car attendant starts the car to make anup trip by closing the car door (not shown). Inasmuch as the carattendant has already closed the up switch UP, the closing of the cardoor and, therefore, the door and gate contact members 55 completes acircuit for energizing the up direction switch U to move the carupwardly. This circuit extends from the suppiy conductor L-i-i (Fig. 3)through the contact members UPI of push button switch UP, the coil of updirection switch U, the contact members D5 and F2 and the door contactmembers 5i! to the supply conductor L-l. The energization of the updirection switch U closes its contact members Ul, U2, U3, U5 and U6 andopens its contact members U4, to effect the upward movement of the car.

The closing of the contact members U5 completes a self-holding circuitaround the contact members UPl of button UP for the coil of up directionswitch U, thereby maintaining that switch in an energized conditionuntil the stopping inductor relay opens its contact members F2.

The closing of the contact members U5 and U2 energizes the separatelyexcited field winding 23 of the generator 22, by a circuit extendingfrom the supply conductor L-l-I through the contact members Ul, theseparately excited field winding 23, the contact members U2 and resistorRM to the supply conductor L l.

The closing of the contact members U3 completes a circuit for energizingthe brake magnet 6 to release the brake 5 by a circuit extending fromthe supply conductor L+l through the contact members U3 and the coil ofelectromagnet 5 to the supply conductor L-I. The closing of the contactmembers U3 also completes a circuit through the restoring relay H whichis in parallel with the brake magnet 6.

The restoring reiay H upon being energized closes its contact membersHI, thereby preparing the circuits of the decelerating and stoppinginductor relays E and F for energization when a stop is to be made.

The opening of the contact members H2 of relay H extinguishes the uplamp IUL at the first floor.

The opening of the contact members U4 of the up switch U interlocks thecircuit for the down direction switch and prevents energization of thatswitch while car A is being operated upwardly.

Inasmuch as the field winding 23 is energized and the brake 5 isreleased by the energization of the brake magnet the generator 22supplies current to the hoisting motor is which, in turn, operates thehoisting drum !3 to raise the car in the hatchway (not shown). Theenergization of the up direction switch U also closes its contactmembers Us, thereby energizing the high speed relay V by a circuitextending from the supply conductor L-l-l through the contact members U6and El and the coil V to the supply conductor L-i.

The energization of the high speed relay V closes its contact members VIto eliminate the resistor R24 from the circuit of the field Winding 23of the generator 22, thereby causing the variable voltage system tooperate the car at high speed.

The car now starts upwardly and in so doing causes the floor selectorarm SM to move upwardly on the floor selector, thereby moving the brush39 up along the row of contact segments a. As car A comes within asuitable predetermined distance of the third floor, the brush 30 engagesthe contact segment 3a energized by the car button 3C and therebycompletes a circuit for energizing the stopping relay S, which circuitextends from the supply conductor L+| through the contact members ofpush button 3C, the contact segment 3a, brush 3%), conductor 5! and thecoil of relay S to the supply conductor Ll. The energized stopping relayS closes its contact members SI, thereby completing a circuit forenergizing the decelerating inductor relay E to decelerate the car as itmoves closer to the third floor. The circuit for this relay extends fromthe supply conductor L+l through the coil E and thence through thecontact members SI and Hi! to the supply conductor L- l.

Inasmuch as the inductor maintaining relay G is in parallel with thecoils E and F, it is also energized by the closing of the contactmembers SI and thereupon closes its contact members G! to provide aself-holding circuit for the inductor relays E and F until the car isstopped and the contact members HI opened as a result thereof.

As the car approaches closer to the third fioor the energized inductorrelay E passes the up high speed inductor plate UE for the third floorand is thereby caused to open its contact members El, thus deenergizingthe high speed relay V which, in turn, opens its contact members Vi andthereby reinserts the resistor R24 in the circuit of the generator fieldwinding 23 to decelerate the car from its high speed to its stoppingspeed.

The deenergization of the high speed relay V also cleses its contactmembers V2 thereby energizing the stopping inductor relay F. Thestopping inductor relay F is now energized and will be operated to bringthe car to a step at the third floor as soon as it comes opposite theinductor plate UF.

At this time the brush 36 runs oiT the energized stopping contactsegment 3a (Fig. 2) and thereby deenergizes the stopping relay S andrestores it to its normal condition.

As car A approaches still more closely to the third floor at itsstopping speed, the inductor relay F comes opposite the inductor plateUF for the third floor and is thereby operated to open its contactmembers F2, thus deenergizing the up direction. switch U.

The deenergization of the up direction switch U opens its contactmembers UI and U2 to deenergize the generator field 23; and opens itscontact members U3 to deenergize the brake magnet 6 and the inductorrestoring relay H.

The deenergization of the field winding 23 and the application of thebrake 5 by the deenergization of the brake magnet 6 causes the car tostop level with the third floor; and the deenergization of the relay Hopens its contact members H! to deenergize and restore the inductorlocking relay G, the decelerating inductor relay F and the stoppinginductor relay E so that they will not be effective. to stop the car inits future operation until the stopping relay S is again energized toeffect the stopping of the car.

The deenergization of the relay H also closes its contact members H3 andthereby completes a circuit for energizing the restoring coil QC on therelay 0 to return that relay to its normal condition. This circuitextends from the supply conductor L+l through the contact members H3,brush 3| now on contact segment 3b, contact segment 3 to the coil OC,conductor 41, contact members 03, and conductors 52 and 53 to the supplyconductor L-I.

The deenergization of the response signalling relay 0 opens its contactmembers 04, thereby I deenergizing the preventing relay 3UK andreturning it to its normal condition, in which condition it closes itscontact members 3UK| to restore the circuit of the up stop signal lampBUT in car A and closes its contact members 3UK3 I (Fig. 5) to restorethe circuit for the up stop signal lamp B3UT in car B. The restored stopsignal lamps are again ready for operation in their proper order undernormal conditions. The contact members 3UK2 also close to render theregistering relay SUR, efiective for the registration of stop calls.

Inasmuch as car A is now stopped at the third floor, the car attendantmay open the door, permit the waiting passenger to enter and thenreclose the door.

Bvthe above operation, it is seen that the pressing of a floor callbutton immediately gives a stop signal in only the nearest approachingcar; that the attendant in that car may set the car stop button at onceupon getting the stop signal regardless of how far away the car is fromthe floor at which the stop signal originates; that the operation orsetting of the car button corresponding to the signalled floor willimmediately acknowledge receipt of the stop signal by lighting the floorlantern of that car at that floor, will cancel the registered stopsignal and extinguish the stop signal light in the car and maintain suchcancellation and extinguishment until the car answers the call, willstop the car when it arrives at the floor and will also prevent anyother car from picking up the stop signal or accepting it. By the termnearest approaching car, I mean the nearest car which is in position orwill be in position to make a stop at the floor for the direction of thestop signal after receiving and accepting that stop signal.

It will be assumed that the car attendant then operates the up pushbutton UP to start the car upwardly. This operation energizes the updirection switch U, which, in turn, energizes the generator fieldwinding 23, the brake magnet 6, the inductor restoring relay H and thehigh speed Lil email;-

any V in the same manner as when the car was moved upwardly from thefirst floor.

The energization of the inductor restoring relay H opens its contactmembers H2, thereby opening the circuit to the up lantern 3UL for car Aat the third floor, thus extinguishing that lantern. Car A is now movingupwardly toward the upper terminal and it is to be understood that itmay be stopped at the upper terminal by a system embodying the old andwell known terminal limit switches or by any other suitable means. Forconvenience in the present system, I have applied the car buttonstopping system to the terminal fioors as well as the other floors.Hence, as car A moves upwardly, the car attendant presses the car button50 to cause the car to slow down and stop at the fifth floor. Thepressing of the button 5C causes it to close its contact members andremain in by reason of the energized condition of the holding coil SCC.The closing of the contact members of the button 50 energizes thestopping segment 5a, but inasmuch as the floor push buttons at the fifthfioor have not been operated, the contact members EDRZ of theregistering relay 5BR are open in the circuit to the response signallingrelay M and, therefore, relay M is not energized by the pressing of thepush button 5C.

Inasmuch as the response signalling relay M is not energized, the floorlantern 5DL at the fifth floor for car A is not lighted.

It will be assumed, however, that after the car attendant presses thecar button BC in car A to stop the car at the fifth floor, a waitingpassenger at the fifth floor, not knowing that the car button had beenpressed to stop the car at that floor, presses the push button 5DJ atthe fifth floor landing.

The pressing of the button 5DJ closes its contact members, therebyenergizing the stop call registering relay SDR by a circuit extendingfrom the supply conductor L+3 (Fig. 4) through the contact members ofpush button 5DJ, the coil 5DR. and the contact members 5DK2 .to thesupply conductor L3. The energization of the relay 5DR closes itscontact members 5DR3, thus providing a self-holding circuit for itselfaround the contact members of the push button 5DJ. The stop call at thefifth fioor is now reg istered; that is, it will be held until it isanswered by a car.

The closing of the contact members 5DR2 of the energized relay 5BRenergized the response signal relay M by a circuit extending from thesupply conductor L+l through the floor button 5C, the coil M, thecontact members W4, 5DR2 and 4UY2 to the supply conductor LI.

It should be understood that the response signal relay M is energized assoon as the floor button 5DJ is pressed, because of the already existingregistered stop call on the car button 50 which closed the contactmembers of the push button 5C leaving the only gap in the circuit forthe relay M to be closed by the contact members SDRZ of the stop callregistering relay for the floor button at the fifth floor.

The energized relay M closes its contact members Ml thereby lighting thefioor lantern 5DL at the fifth floor for car A to indicate to thewaiting passenger which car will stop for him so that he may at oncestep to the door of that car and be ready to enter it when it arrivesand opens the door for him.

The energized response signalling relay M closes its contact members M3,thereby energizing the preventing relay 5DK (Fig. 4) by a circuitextending from the supply conductor L+3 through the contact members M3and W8 and the coil 5DK to the supply conductor L3.

The energization of the preventing relay SDK 5 opens its contact members5DK2, thereby deenergizing the registering relay 5BR. Although theregistering relay SDR is restored to its deenergized condition, itcannot be reenergized by pressing the button 5DJ at this time becausethe contact members 5DK2 are still open and prevent the completion ofthe energizing circuit for relay 5BR. The registering relay will remainin this condition until the car stops at the fioor.

The energized preventing relay 5DK opens its 15 contact members 5DK|(Fig. 3) in the circuit of the stop signal lamp 5DT in car A toextinguish that lamp and prevent its re-operation for the fifth floor.

The energized preventing relay 5DK also opens its contact members 5DK3(Fig. 5) in the circuit leading to the stop signal lamp B5DT to preventcar B from picking up the stop signal for the fifth floor if it shouldpass car A.

From the above, it is seen that the pressing of the floor button afterthe nearest car approaching for that direction for that floor hasalready registered a car button stop call for that floor, gives animmediate response signal to the waiting passenger indicating which carwill stop.

It is also seen that the attendant in the car uses the same car buttonto stop the car at a floor regardless of whether the stop call comesfrom a passenger in the car or from a passenger at the floor.

As car A continues toward the fifth floor, the stopping brush engagesthe energized stopping segment 5a, thereby energizing the stopping relayS through a circuit extending from the supply conductor L-I-l throughthe contact members of car button 50, contact segment 5a, brush 30,conductor 5| and the stopping relay S to the supply conductor Ll.

The energization of the stopping relay S opens its contact members SI tocause the energization of the inductor relays and subsequent operationby the inductor plates for the fifthfloor and stopping of the car at thefifth floor in the same manner as has been described in stopping the carat the third floor.

As the car arrives at the fifth floor, the cancellation brush 3| engagesthe cancelling contact segment 5b, thereby completing a circuit forenergizing the restoring coil MC of the response signal relay M, whichcircuit extends from the supply conductor L+l through the contactmembers H3, brush 3|, contact segment 55, contact segment 5 restoringcoil MC, the contact members M2 and conductor 53 to the supply conductorL l.

The energization of the coil MC deenergizes the coil M and restores itto its normal condition. The deenergization of the relay M opens itscontact members M3 in the circuit of the preventing relay 5DK, therebydeenergizing that relay which, in turn, closes its contact members 5DKI,5DK3 and BDKZ to restore the circuits of the stop signal lamp BDT in carA, the stop signal lamp B56! in car B and the registering relay BDR forthe fifth floor to their normal condition.

It is now assumed that the car attendant in car A opens the door topermit the loading and unloading of passengers and then presses the downpush button DP to prepare. the car for a down trip.

The closing of the contact members DPI of the down direction push buttonDP prepares a circuit for energizing the down direction switch D, whichcircuit will be completed when the doors are closed.

The. pressing of the down push button DP opens its contact members DPZ,thereby deener- 'gizing the, up direction preference relay W,

which, in turn, closes its contact members WI, thereby completing acircuit for energizing the down direction preference relay X to preparethe circuits of car A for the down trip. This circuit extends from thesupply conductor L-l-i through the closed contact members UP2 of pushbutton UP, the coil X and the contact members WI to the supply conductorL I.

Inasmuch as the up direction preference relay W has been deenergized toopen its contact memmers W3 and the down direction preference relay Xhas been energized to close its contact members X3, the holding coilsICC, C, C, 4G0 and 5C0 for the car buttons in car A have beendeenergized to release all the push buttons operated on the up trip andhave been reenergized so that on the down trip as the push button ispressed inwardly, it will be held in that position by the correspondingholding coil until the car gets to. the end of its down trip.

The coil of the electromagnet 4| which is in parallel relation to thecoil of the relay X is also.

energized by the closing ofthe contact members WI of relay W to tiltthefioor selector arm SM from its up trip position to its down tripposition, thereby preparing the floor selector for the down trip.

With the floor selectorarm SM in the down position, the brush 36 engagesthe contact segment 5g and thereby completes a circuit for maintainingthe floor lantern 5DL at the fifth fioor in a lighted condition whilethecar stands at that floor, This circuit extends from thesupplyconductor L+2 (Fig. 3) through the down lamp EDL, contact segment5g, brush 36. and the contact members 1-12 to the supply conductor L2.

Also the down contact brush 31 engages the down zone feeding contact 5h,thereby energizing the down zone feed relay EDY by a circuitextendingfrom the supply conductor L+2 through the coil EDY, the contact segment5H and brush 3'! to the supply conductor L-2.

The closing of the contact members 5DYlfeedsthe zone circuit representedby conductor 44 leading to the down lamps 4DT, etc., and the annunciatorin car A; that is, these contact members connect one portion of the zonecircuit 44 to the supply conductor L-Z, thus preparing that zone circuitfor operation. Inasmuch as the down call at the fourth floor isregistered and is awaiting the approach of a down car, the closing ofthe contact members 5DYl feeding the down zone circuit for car A causesthe down signal lamp 4DT in carA to be lighted by a circuit extendingfrom the supply conductor L-l-2 to the lamp 4DT. and the contact membersADRI, 4DK| and SDYI to the supply conductor L-2. The lighting of thelamp 4DT notifies the attendant in car A that a waiting passenger at thefourth floor desires him to make a down stop at that floor.

t should be observed at this point-that the circuit which was preparedfor the lamp 4DT by the closing of the contact members 4BR! on theregistering relay "iDR could not be completed through any other portionof the zone circuit 44.

because the. zone relay contact members 4DZl were open in conductor 44as a result of car B standing at the third floor on a down trip.

The energization of the zone feeding relay 5DY also closes its contactmembers 5DY2, thereby feeding the. zone circuit represented by theconductor 45 leading to the response signalling relays M, O, P and Q.for car A.

It will be assumed that the operator upon noticing the lighting of thestop signal lamp 4DT indicating a down stop at the fourth floor,thereupon presses the push button in the car to notify the passengerthat his call has been accepted, and. which car will make the stop forhim and also to. stop the car when it arrives at the fourth fioor.

The pressing of the. car stop button 4C energizes the. stopping contactsegment 4e and also completes. a circuit for energizing the responsesignalling relay N, which circuit extends from the supply conductor L+l(Fig. 3) through the contact members of. push button 40, the coil ofresponse signalling relay N, conductor 54, contact members X4, 4DR2 and5DY2 to the supply conductor L I The energization of the responsesignalling relay N closes-its contact members N3, thereby completing aself-holding circuit for itself and causing the coil N to remainenergized until the restoring coil NC is energized to restore it to itsnormal condition.

The closing of the contact members N2 of relay N completes a circuit forlighting the down floor lantern 4DL for car A at the fourth floor, whichcircuit extends from the supply conductor L+2 through lamp 4DL and thecontact members N2 and XZ tothe supply conductor L-2. Thus, it is seenthat the down fioor lantern at the fourth floor for car A is lighted assoon as the car attendant presses-the corresponding stop car button and.thereby indicates to the waiting down passenger-at the fourth floor thathis call has been acknowledged, that a car will stop for him, and whichdoor the car-willstop at so that he may at once step to that door and beready to board the car when'it arrives and the door opens.

It will be noted that in this illustration of my invention, the zones donot extend around the corner, so to speak; that is, the up trip isdivided into a number of zones and the down trip is divided into anumber of zones but no zone includes portions ofboth-the up and the downtrips. If desired, this system may be readily constructed to extend thezones around the corner as shown in the copending patent application ofEdgar M. Bouton and myself, filed September 9, 1933, Serial No. 688,784and assigned to the Westinghouse Electric Elevator Companyto whichreference may be had for further details.

The. energization of the relay N also closes its contact members N4,thereby energizing the down preventing relay-4DK by a circuit extendingfrom the supply conductor L+3 (Fig. 4) through the contact members-N4,the contact members X8 and the coil 4DK to the supply conductor L-3.

The energization of the relay 4DK operates to prevent any other car fromreceiving the down stop signal registered for the fourth fioor andaccepted by car A. To do this, the energized relay 4DK opens its contactmembers 4DK3 (Fig. 5) in the circuit leading-to the down signal lampB4DT in the annunciator of car B. Thus, it will be seen that even thoughcar Bshould come to the fifth floor or pass car A, the down signal lampfor the fourth floor cannot be lighted in car 13.

ill

The energization of the relay IDK also opens its contact members 4DKI(Fig. 3) in the circuit to the down signal lamp 4DT in car A, therebyextinguishing that lamp.

The energization of the relay 4DK opens its contact members 4DK2 in thecircuit of the stop signal registering relay IDR, thereby deenergiz' ingthat relay and preventing its reenergization until the car stops at thefourth floor.

It will be assumed now that the attendant in car A closes the car door(not shown) thereby closing the door contact members 59 and thuscompleting a circuit for energizing the down direction switch D to movethe car downwardly. This circuit extends from the supply conductorL-|.-I through the contact members DPI of down switch DP, the coil ofdown switch D and the contact members U4, FI, and 50 to the supplyconductor L-I. The energization of the down direction switch D closesits contact members DI, D2, D3, D4 and D5 and opens its contact membersD5, to efiect the downward movement of the car.

The closing of the contact members D4 completes a self-holding circuitfor the down switch D.

The opening of the contact members D5 pre vents energization of the updirection switch U while the car is being operated downwardly.

The closing of the contact members DI and D2 energizes the separatelyexcited field winding 23 and the generator 22 by a circuit extendingfrom the supply conductor L+I through the contact members D2, thewinding 23, the contact members DI and resistor R24 to the supplyconductor L-I.

The closing of the contact members D3 completes a circuit for energizingthe brake magnet 6 to release the brake 5 and to also energize theinductor restoring relay H.

The restoring relay I-I upon being energized closes its contact membersHI thereby preparing the circuits of the decelerating and stoppingrelays E and F for energization when a stop is to be made.

The opening of the. contact members H2 of the energized relay Hextinguishes the down lamp EDL at the fifth floor.

Inasmuch as the field winding 23 is energized and the brake 5 isreleased, the generator 22 supplies current to the hoisting motor I8,which, in turn, operates the hoisting drum I3 to lower the car in thehatchway.

The energized down direction switch D also closes its contact membersD3, thereby energizing the high speed relay V, which, in turn, closesits contact members VI to eliminate the resistor R24 from the circuit ofthe field winding 23 of the generator, thereby increasing the speed ofthe car.

The car now moves downwardly and in so doing causes the floor selectorarm SM to move downwardly on the floor selector, thereby bringing thedown stopping brush 34 into engagement with the energized down stoppingcontact segment 4e, thereby completing a circuit for energizing thestopping relay S to stop the car at the fourth floor, which circuitextends from the supply conductor L+ I through the contact members ofthe car button 4C the contact segment 4e, brush 34 and the coil ofstopping relay S to the supply conductor LI.

The energized stopping relay S closes its contact members SI, therebycompleting a circuit for energizing the decelerating relay E todecelerate the car as it moves closer to the fourth fioor. The circuitfor this relay extends from the supply conductor L+I through the coil Eand the contact members SI and HI to the supply conductor LI.

The inductor maintaining relay G is also energized as heretoforedescribed, thus closing its contact members GI to provide a self-holdingcircuit for the inductor relays.

As car A approaches closer to the down stop at the fourth floor, theenergized inductor relay E passes the down high speed inductor plate DEfor the fourth floor, thereby opening its contact members E2 and thusdeenergizing the high speed relay V, which, in turn, opens its contactmembers VI and thereby reinserts the resistor BM in the circuit of thegenerator field winding '23 to decelerate the car from its high speed toits stopping speed.

The deenergization of the high speed relay V also closes its contactmembers V2, thereby energizing the stopping inductor relay F, which maynow be operated to bring the car to a stop.

At this time the brush 34 runs off the stopping contact segment 4e (Fig.2) and thereby deenergizes the stopping relay S and restores it to itsnormal condition.

As car A approaches still more closely to the fourth fioor, at itsstopping speed, the stopping inductor relay F comes opposite the downinductor plate DF for the third fioor and is thereby operated to openits contact members F2, thus deenergizing the down direction switch D.

The deenergization of the down direction D opens its contact members DIand D2 to deenergize the generator field winding 23; and opens itscontact members D3 to deenergize the brake magnet 6 and the inductorrestoring relay H.

The deenergization of the field winding 23 and the application of thebrake 5 by the deenergization of the brake magnet 6 causes the car tostop level with the second floor and the deenergization of the relay Hopens its contact members HI to deenergize and restore the inductorlocking relay G, the decelerating inductor relay F and the stoppinginductor relay E so that they will not operate to stop the car untilrelay S is again energized.

The deenergization of relay H also closes its contact members H3 andthereby completes a circuit for energizing the restoring coil NC on therelay N to return that relay to its normal condition. This circuitextends from the supply conductor L+I through the contact members H3,brush 35, contact segment 4), the coil NC, conductor 54, contact membersN3 and conductors 52 and 53 to the supply conductor L-I.

The deenergization of the response signalling relay N opens its contactmembers N4, thereby deenergizing the preventing relay 4DK and returningit to its normal condition. The deener gized relay IDK closes itscontact members 4DKI to restore the circuit of the stop signal lamp DTin car A, and closes its contact members 4DK3 (Fig. 5) to restore thecircuit for the stop signal lamp B iDT in car B. The restored stopsignal lamps are again ready for operation in their proper order undernormal conditions. The energization of relay lDK also closes its contactmembers 4DK2 to restore the registering relay 4DR. to its normalcondition.

Inasmuch as car A is now stopped at the fourth floor on a down trip, thecar attendant may open the doorfor the waiting passenger to enter thecar.

Referring back to the point in the operation of car A where it left theground floor, it will be recalled that the zone feeding relay IUY wasenergized by the position of the brush 3-3 on contact segment Ed. As carA moves up to the second floor, the contact brush 33 moves out ofengagement with segment Id and into engagement with the contact segment2d. thus deenergizing zone feeding relay EUY and energizing zone feedingrelay ZUY.

The deenergization of the zone feeding relay lUY opened itscontactmembers I'UYI leading to the up zone conductor 4.3 for car A inconnection with the up. stop signal lights in car A, and the openin ofthe contact members lUYZ" opened the feed circuit to the zone circuitit. The energization of the zone feeding relay 2:U.Y closed its contactmembers leading to that section of the zone circuit above the contactmembers EUZi of the zone relay 2.132. The closing of the contact members2U'Y3 (Fig. 4) closed the circuit to the zone relay ZUZ', whichenergized that relay and caused it to open its contact members ZUZl.

Therefore, with car A at the second floor and with the contact membersZUZI open and the contact members ZUYI; closed, my stop signal calls forfloors above the second floor could be received car A but calls belowthe. second floor could. not be received by car A. With car'A stand ingat the second floor, the effective zone for receiving stop signal callsby car A extended. in front of that car up to the uppermost terminalbecause no car was stationed above car A. Thus the zone above car A maybe called the effective zone and the zone below car A may be called theineffective zone.

On the other hand, the effective signal zone for car 13 standing on adown trip at the third floor extended down to and included the firstfloor but could not extend to car A at the second floor, because thefloor selector arm BSM of car Bv was in a down position and not in an upposition.

It should also. be noted. that the deenergized condition of zone feedingrelay tUY opens its eontact members IUYZ in the zone circuit 45 leadingto the response signalling relays and that the energized condition ofzone feeding relay 2DY has energized the zone relay ZUZ which opens itscontact members BUZZ in the zone circuit d8, thereby cutting off theresponse signalling relays for car A below the third floor.

As car A moved from the second floor to the third floor, the zonefeeding relay ZUY was deenergized and the feeding relay EUY wasenergized by the zone feeding brush 33 moving from the contact segment20! to the contact segment 311. In this position of car A, its signalzonenow extends from car A at the third floor up to and including theupper terminal. Similarly, as the car advances to thefoultth and fifthfloor, the signal zone for car A advances with it and the signal circuitbelow it is cut off by the operation of the zone feeding relays UY andthe zone relays UZ.

Returning now to a consideration of car B standing at the third floor ona down trip, it will be assumed that a waiting passenger at the lowerterminal, desirous of making an up trip, presses the up floor buttonI'UJ to give a stop signal in the nearest approaching car.

The operation of the button lUJ closes its contact members and, therebyenergizes th registering relay IUR by a circuit extending from thesupply conductor L+3 through the contact members of button iUJ, the coilIUR, and the contact members IUK2 to the supply conductor L-3.

The energization of the, registering relay IUR closes its contactmembers IUR3 and thereby provides a self-holding circuit for itself.

The energization of relay IUR; closes its contact members l UR-l inthecircuit leading to the stop signal lam-plUT in car A at the fourth floorbut that stop signal fails to light because the zone contact membersSDZI and the zone feeding relay contact members 3DYI and 2DYI- are open,by reason of the position of car A at the fourth floor, and, therefore,nocurrent can feed to the stop signal lamp IUT. Thus the signal lamplUT' in car A for the lower terminal does not light and it is the zonesystem that prevents it from lighting because car B at the third flooris the nearest approaching car to the registered stop signal at floor i.

The energization of the relay IUR also closes its contact members I UR2in the circuit leading to the response signalling relay Q of car A butno circuit can be completed through relay Q by reason of the fact thatthe zone relay contact members 3DZ2 are open and the zone feeding relaycontact members 3DY2 and 2DY2 are open, thus preventing any current fromflowing through the relay Q even if the button IC in car A wereoperated".

It may be noted here that as a result of this system if any other carthan the nearest approaching car to a stop signal operates a car buttonto stop at the same floor asthe, stop: signal, the operated car buttonwill not be able to energize its response signalling relayfor the stopsignal floor and, therefore, will not be able to light its correspondinglantern as it approaches that floor. However, its floor lantern willlightwhen it comes to rest at the floor.

In View of the above, it is seen that the stop signal registered atfloor I cannot get through to car A which is behind car B on account ofthe signal zone system.

Referring again to the energization of relay lUR, this conditon causesit to close its contact members [UB5 in the circuit leading to theresponse signalling relay BQ and inasmuch as the contact members 21324and BtDY3 are closed by reason of the position of car A, the responsesignalling relay BQ for car B can be energized by operation of the pushbutton BIC in car B.

The energized relay' I'UR closes its contact members IUR4 in the circuitleading to the stop signal lamp BIUT incar B and thereby energizes andlights that lamp through a circuit extending from the supply conductorL+ 5, the lamp-BlUT, contact members [UB4 and IUK3, the contact members2DZ3 and conductor 59 and contact members B3DY2- to the supply conductorL-S.

The lighting of the stop signal lamp BlUT in car B notifies theattendant in that car that a passenger wants a car at floor I. Thereuponthe car attendant in car- B at once presses his car button BiC toacknowledge the receipt of the stop signal to take over the stop callfor that floor, to light the lantern for car B at that floor to indicateto the waiting passenger which door he should go to in order to boardthe car when it arrives, and also to stop the car when it arrives atdoor I.

The pressing of the button BIC energizes the stopping contact segmentBle and also the responsesignalling relay BQ'by a circuit extending fromthe supply conductor L+5 (Fig. 5) through iii

